OK tried the solution/workaround from the URL I've posted. That is add acpi_enforce_resources=lax to kernels command line, create a file /etc/modules-load.d/headphone.conf with the lines cat /etc/modules-load.d/headphone.conf i2c_dev i2c_i801 download the python script init-headphone wget https://raw.githubusercontent.com/ektor5/init-headphone/master/init-headphone then suspend, resume, and first check that there is no sound ... then run sudo python init-headphone and sound on headphone is back again!